Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Current assets
Cash	$ 6,801	$ 9,175
Accounts receivable, net
Trade - billed (less allowances of approximately $953 and $806, respectively), including contract retentions	20,055	17,209
Trade - unbilled	637	525
Inventories, net
Raw materials	2,939	2,329
Finished goods	4,012	2,821
Prepaid expenses	1,246	1,266
Total current assets	35,690	33,325
Property and equipment, net	28,826	27,680
Other assets	337	343
Total assets	64,853	61,348
Current liabilities
Accounts payable - trade	6,944	7,336
Accrued expenses and other liabilities	1,900	831
Deferred revenue	3,217	2,717
Accrued compensation	871	1,203
Accrued income taxes	831	473
Operating lease liabilities	34	43
Current maturities of notes payable	640	636
Customer deposits	2,950	2,779
Total current liabilities	17,387	16,018
Deferred revenue	5,572	4,424
Operating lease liabilities	0	2
Notes payable - less current maturities	4,931	5,092
Deferred tax liability	1,650	1,651
Total liabilities	29,540	27,187
Stockholders' equity
Preferred stock, $.01 par value; authorized 1,000,000 shares, none issued and outstanding	0	0
Common stock, $.01 par value; authorized 8,000,000 shares; 5,349,599 and 5,349,599 issued and 5,308,679 and 5,308,679 outstanding, respectively	54	54
Additional paid-in capital	7,819	7,814
Treasury stock, at cost, 40,920 shares	(102)	(102)
Retained earnings	27,542	26,395
Total stockholders' equity	35,313	34,161
Total liabilities and stockholders' equity	$ 64,853	$ 61,348